sodium hydroxide; water T=20 - 25°C; 4 h;

1,4-dioxane; potassium carbonate Erhitzen des Reaktionsprodukts mit wss. NaOH;

1: 38 percent / NaH / dimethylformamide; diethyl ether / 15 h / Ambient temperature 2: 1.) 1.5 M n-BuLi / 1.) hexane, ether, room temp., 2 h, 2.) hexane, ether, -70 deg C to room temp., 2 h View Scheme

n-butyllithium 1.) hexane, ether, room temp., 2 h, 2.) hexane, ether, -70 deg C to room temp., 2 h; Yield given. Multistep reaction;

oxalyl dichloride; N,N-dimethyl-formamide in dichloromethane T=20 - 25°C; 1 h;